Download and run the free Everest, or Belarc Advisor at www.belarc.com. That software will inventory your system and give you a printable report...
From that you can do a search for the device and drivers.
or two,
Use the computer brand and model to go to the manufacturer's website, or use the motherboard numbers from around the center or edge of the board, and do a Google search.
See what is listed, if anything in Start->Control Panel->System->Hardware->Device Manager.
Or tell us the brand and model of computer or motherboard.
If you have a video graphics card, remove it and write down all the information printed on the board, as well as the numbers off the largest chip. Google search by those digits.
You are correct that sometimes the video graphics will not post details without drivers.